Cosine (abbreviated as cos) is a trigonometric function that relates the ratio of the adjacent side of a right triangle to its hypotenuse. In other words, it represents the ratio of the length of the adjacent side to the length of the hypotenuse. The cosine function is defined as:
cos(theta) = adjacent side / hypotenuse
where theta is the angle between the hypotenuse and the adjacent side of the right triangle. The value of cos(theta) ranges from -1 to 1.
cosine
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